"Due to lags and loading issues in previous test sessions, we’ll be updating the entire structure of the character database. The new version will not be compatible with the old, which means that all minifigures will get wiped prior to the May 6 test session. Even though this might feel a little upsetting, it's truly for your benefit only as game performance will greatly improve! We hope you’ll have fun building new minifigures, and enjoy the enhanced performance of the game."

There were actually people on the forums that were thinking they could keep the beta characters. I can't wait to see the reaction